单项选择题

A．Being unable to communicate face to face with others.
B．Having exams and tests.
C．Phone calls are expensive.
D．Professors are tough.
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单项选择题
A．Because it’s shining.B．Because it’s rare.C．Because it’s expensive.D．Because it came from ancient times.
A．Because it’s shining.
B．Because it’s rare.
C．Because it’s expensive.
D．Because it came from ancient times.
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